Refactor: Get the latest version from Homebrew (#28)

Refactoring

* feat: Add reject to Promise
* feat: Add printing inputs
* feat: Add error handling to getLatestVersion()
* feat: show version of Hugo, Go, and Git (Close #23)
* refactor: Get the latest version from Homebrew (Close #26)
* refactor: enhance error message of promise reject

Enhancement for workflow

* gha: Add deps (test-prod job needs test job)
* gha: Fix matrix testing
* gha: comment out Build production step
* gha: remove Dump step

Update README

* docs: update readme

package.json

@@ -26,6 +26,7 @@
   "homepage": "https://github.com/peaceiris/actions-hugo#readme",
   "dependencies": {
     "@actions/core": "^1.1.0",
+    "@actions/exec": "^1.0.1",
     "@actions/io": "^1.0.1",
     "@actions/tool-cache": "^1.1.1",
     "xmlhttprequest": "^1.8.0"